Observations of two-fold shell filling and Kondo effect in a graphene nano-ribbon quantum dot device

Details Observations of two-fold shell filling and Kondo effect in a graphene nano-ribbon quantum dot device Observations of two-fold shell filling and Kondo effect in a graphene nano-ribbon quantum dot device

2009-10-30

arxiv.org/abs/0910.5777v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

A graphene nanoribbon (GNR) with orientation along its principle axis was obtained through a mechanical tearing process, and a quantum dot device was fabricated from the GNR. We have studied the transport property of the GNR quantum dot device down to dilution refrigerator temperatures. Two-fold charging periodicity was observed in the Coulomb-blockade measurement, signaling a shell-filling process with broken valley degeneracy. In one of the smaller Coulomb diamonds, Kondo-like resonance were observed, with two conductance peaks displaced symmetrically from the zero bias voltage. The splitting of Kondo resonance at zero magnetic field suggests spin-polarization of the quantum dot, possibly due to the edge states of a zigzag GNR.

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